Mondo Description A benign, multifocal, nodular and well-circumscribed neoplasm usually seen as a congenital neoplasm or in the first year of life. It is characterized by a biphasic growth pattern and is composed of small, undifferentiated mesenchymal cells associated with branching thin-walled vessels and more mature neoplastic spindle cells with abundant eosinophilic cytoplasm in a collagenous stroma.

Disease Ontology Description A connective tissue benign neoplasm that is characterized by the development of benign tumors in the skin, striated muscles, bones, and in exceptional cases, visceral organs.